Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| chilling-induced ethylene production in cucumbers (cucumis sativus l.). | 1-aminocyclopropane-1-carboxylic acid (acc) level, acc synthase activity, and ethylene production in cucumbers (cucumis sativus l.) remain low while the fruit are held at a temperature which causes chilling injury (2.5 degrees c) and increase rapidly only upon transfer to warmer temperatures. the increase in acc synthase activity during the warming period is inhibited by cycloheximide but not cordycepin or alpha-amanitin. our data indicate that the synthesis of acc synthase, which results in inc ... | 1982 | 16662222 |
| separation of mg-protoporphyrin ix and mg-protoporphyrin ix monomethyl ester synthesized de novo by developing cucumber etioplasts. | high pressure liquid chromatography was used to demonstrate that chelation of mg(2+) into protoporphyrin ix precedes methylation in isolated greening etioplasts from cucumber (cucumis sativus l. var. beit alpha) cotyledons. mg-protoporphyrin ix synthesized in vitro from protoporphyrin ix, mg(2+), and atp or exogenous mg-protoporphyrin ix could serve as substrates for the methylation step. in either case, s-adenosylmethionine was the methyl donor and could not be replaced by atp plus methionine. | 1982 | 16662221 |
| a potential pathway for galactose metabolism in cucumis sativus l., a stachyose transporting species. | conversion of [(14)c]galactose (gal) 1-p, udp-[(14)c]gal, or udp-[(14)c]glucose to [(14)c]sucrose was observed when cell-free homogenates of cucumber (cucumis sativus l.) fruit peduncles were incubated with individual (14)c-labeled substrates, appropriate cofactors, and fructose. the sucrose product was labeled only in the glucose moiety. conversion of [(14)c]gal-1-p to [(14)c]sucrose was catalyzed by extracts of peduncles from all other stachyose transporting species tested, as well as green be ... | 1982 | 16662141 |
| membranes of protein bodies. ii. detection and partial characterization of membrane glycoproteins. | the synthesis of organelle proteins was studied in cotyledons of cucumis sativus. protein constituents of protein-body membranes were shown to be synthesized and assembled, at a stage characterized by mobilization of the storage globulin. besides l-[35s]methionine various labelled hexoses were incorporated into protein bodies of cucumber cotyledons. while d-[u-14c] glucose functioned as precursor of a broad spectrum of glycoproteins, d-[6-3h]glucosamine was selectively incorporated into four gly ... | 1982 | 7056256 |
| membranes of protein bodies. i. isolation from cotyledons of germinating cucumber seeds. | protein bodies were prepared from cotyledons of germinating seeds of cucumber (cucumis sativus) in different ways: the organelles either obtained from protoplasts by lysis or from cotyledons by mechanical disintegration were separated on sucrose-density gradients. in addition, a non-aqueous procedure was employed to isolate protein bodies. marker proteins indicative of membranes of other organelles were carefully assayed. by this means contaminations in the purified protein-body fractions could ... | 1982 | 7056255 |
| development of glutamate:glyoxylate aminotransferase in the cotyledons of cucumber (cucumis sativus) seedlings. | glutamate:glyoxylate aminotransferase had been reported to be present exclusively in the peroxisomes of plant leaves and to participate in the glycollate pathway in leaf photorespiration (tolbert (1971) annu. rev. plant physiol. 22, 45-74]. glutamate:glyoxylate aminotransferase activity was already present in the etiolated cotyledons of cucumber (cucumis sativus) seedlings, and increased during greening. the enzyme was present only in the cytosol of the etiolated cotyledons and appeared in the p ... | 1982 | 6805464 |
| activity in vivo and redox states in vitro of nitro- and chlorodiphenyl ether herbicide analogs. | excised cucumber (cucumis sativus l. cv 447 wisconsin smr 18) cotyledons were sensitive to acifluorfen-methyl (methyl 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoate) and mc-15608 (methyl 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-chlorobenzoate). injury was detected by monitoring efflux of 3-o-methyl-d-[u-(14)c]glucose from herbicide-treated tissue after exposure to light. efflux kinetics of 3-o-methyl-[(14)c]glucose from cotyledons treated with either acifluorfen-methyl (afm) or mc-1560 ... | 1983 | 16663347 |
| carbohydrate changes during maturation of cucumber fruit : implications for sugar metabolism and transport. | changes in the carbohydrate profiles in the mesocarp, endocarp, and seeds of maturing cucumber (cucumis sativus, l.) fruit were analyzed. fruit maturity was measured by a decrease in endocarp ph, which was found to correlate with a loss in peel chlorophyll and an increase in citric acid content. concentrations of glucose and fructose (8.6-10.3 milligrams per gram fresh weight, respectively) were found to be higher than the concentration of sucrose (0.3 milligrams per gram fresh weight) in both m ... | 1983 | 16663031 |
| solutes in the free space of growing stem tissues. | the concentration of osmotically active solutes in the cell wall free space of young stem tissues was studied using a variety of extraction methods. when the intercellular air spaces of etiolated pea (pisum sativum l.) internodes were perfused with distilled h(2)o, the resulting solution contained a solute concentration of about 70 milliosmoles per kilogram. a second procedure involving vacuum infiltration of segments followed by centrifugation to collect the free space solution gave similar res ... | 1983 | 16663001 |
| preliminary crystallographic data for plastocyanins from an alga (enteromorpha prolifera) and from cucumber (cucumis sativus). | the plastocyanins from a green alga (enteromorpha prolifera) and cucumber (cucumis sativus) have been crystallized. crystal data are as follows: e. prolifera plastocyanin, space group i4, a = b = 53.9 a, c = 59.4 a, z = 8; c. sativus plastocyanin, space group p4(1) (or p4(3) ), a = b = 66.7 a, c = 46.0 a, z = 8. accordingly, the asymmetric units of the crystals contain one and two molecules, respectively. | 1983 | 6842595 |
| developmental changes in the potential for h(2)s emission in cucurbit plants. | based on results obtained with leaf discs exposed to sulfate, leaves on cucurbit plants (cucurbita pepo l. cv small sugar pumpkin and cucumis sativus cv chipper) 1 to 2.5 weeks old have a low potential for h(2)s emission (less than 10 picomoles per min per cm(2) leaf area) in response to sulfate, whereas discs from most of the leaves on plants 3 to 4 weeks old emit h(2)s at a higher rate (50 to 150 picomoles per min per cm(2) leaf area). this difference is determined by the age of the plant, and ... | 1983 | 16662816 |
| inhibition by calcium of senescence of detached cucumber cotyledons: effect on ethylene and hydroperoxide production. | the effect of ca on senescence was followed in detached cucumber (cucumis sativus l.) cotyledons floating on various solutions in the dark. compared with those in water, cotyledons in 10(-4) molar cacl(2) exhibited reduced chlorophyll loss and h(2)o(2) production, reduced and delayed ethylene production, and did not undergo a burst in co(2) production. in contrast, mg had little effect on cotyledon senescence, whereas k stimulated chlorophyll loss but did not increase h(2)o(2) accumulation of et ... | 1983 | 16662782 |
| cellular expansion at low temperature as a cause of membrane lesions. | rates of solute leakage from excised discs of cucumber (cucumis sativus l. cv straight eight) cotyledons were altered by temperature during plasmolysis in the manner of a simple diffusion phenomenon; the log of the leakage rate increased in proportion to the temperature. during deplasmolysis, however, leakage rates responded to temperature with a very different pattern: chilling conditions (below about 20 degrees c) caused large increases in leakage rates, indicating disruption of membrane integ ... | 1983 | 16662768 |
| contrasting gene flow patterns and genetic subdivision in adjacent populations of cucumis sativus (cucurbitaceae). | 1983 | 28568124 | |
| purification and characterization of hydroxypyruvate reductase from cucumber cotyledons. | hydroxypyruvate reductase (hpr), a marker enzyme of peroxisomes, has been purified to homogeneity from cotyledons of light-grown cucumber seedlings (cucumis sativus var. improved long green). in addition, the peroxisomal location of both hpr and serine-glyoxylate aminotransferase has been confirmed in cucumber cotyledons. the isolation procedure involved polymin-p precipitation, a two-step precipitation with ammonium sulfate (35 and 50% saturation), affinity chromatography on cibacron blueagaros ... | 1983 | 16663015 |
| aspartyl proteinase from cucumber (cucumis sativus) seeds. preparation and characteristics. | aspartyl proteinase (ec 3.4.23) from cucumber seeds was purified by ammonium sulphate fractionation, chromatography on immobilized pepstatin and gel filtration on sephacryl s-200. the preparation obtained, homogeneous on polyacrylamide-gel electrophoresis in acidic and alkaline media, has a molecular mass of 42,000, pi of 5.2, and shows the highest activity with denatured haemoglobin at ph 3.2. the proteinase is stable in slightly alkaline medium, whereas it is inactivated in acidic medium, espe ... | 1983 | 6346762 |
| the positive hook: the role of gravity in the formation and opening of the apical hook. | photographic observations on germinating seedlings of lepidium sativum l., cucumis sativus l., and helianthus annuus l. showed that the hypocotyl hook is not present in the seed but forms during the early stages of growth. evidence that gravity plays a major role in inducing curvature of the hypocotyl, and in maintaining the hook once it has been formed, was obtained from clinostat experiments, from the use of morphactin to remove geotropic sensitivity and from inversion of seedlings to change t ... | 1983 | 24264451 |
| accumulation and transport of (2,4-dichlorophenoxy)acetic acid in plant cuticles: i. sorption in the cuticular membrane and its components. | partition coefficients (k) of (2,4-dichlorophenoxy)acetic acid (2,4-d) have been determined for the system plant cuticle/aqueous buffer. cuticles isolated enzymatically from leaves (clivia miniata, ficus elastica, citrus aurantium, hedera helix, pyrus communis cv. conférence and cv. williams, olea europaea) and fruits (lycopersicon esculentum, capsicum annuum, solanum melongena, cucumis sativus) were utilized. only the nondissociated species of 2,4-d was sorbed by cuticles and their lipophilic c ... | 1984 | 6734501 |
| [capacity of triterpene glycosides from holothurians to stimulate antibacterial resistance in a model of experimental murine salmonellosis]. | when injected intraperitoneally into mice in doses of 40.0-0.4 microgram, cucumarioside, the preparation of triterpene glycosides obtained from sea cucumbers (cusumaria japonica), enhanced the resistance of the animals to the subsequent challenge with salmonella typhimurium. the study of the duration of the persistence of salmonellae in mice receiving the preparation in a dose of 0.001 microgram revealed a decrease in the contamination of their organs. the same dose of the preparation stimulated ... | 1984 | 6377780 |
| [effect of cucumarioside (a triterpene glycoside from the holothurian cucumaria japonica) on the development of an immune response in mice to corpuscular pertussis vaccine]. | the influence of cucumarioside, triterpene glycoside obtained from cucumaria japonica (echinodermata, holoturioidea), or sea cucumbers, on the resistance of mice to bordetella pertussis infection (with the use experimental pertussis meningoencephalitis as a model) and on the development of immune response to corpuscular pertussis vaccine was studied. the preparation under test was shown to have greatly pronounced immunomodulating properties depending on both the concentration of cucumarioside an ... | 1984 | 6506936 |
| survey of fresh vegetables for nematodes, amoebae, and salmonella. | contamination by nematodes, amoebae, and bacteria of the genus salmonella was estimated in a 2-year survey of salad vegetables obtained from wholesale and retail sources. the vegetables examined were cucumbers, cabbage, lettuce, celery, carrots, radishes, tomatoes, mushrooms, cauliflower, and spinach. nematode eggs and larvae were recovered by the nacconol-ether centrifugation method. some nematode eggs were identified as parasitic ascaris sp.; the majority of larval nematodes were thought to be ... | 1984 | 6540260 |
| a development-dependent hemagglutinin from cucumber surfaces: i. hemagglutinin activity of cotyledon surfaces. | during studies on the chemistry of plant surfaces, we observed that concomitant with the development of cucumber (cucumis sativus l. cv ;elem') cotyledons an agglutinin that agglutinates human erythrocytes appeared on epicuticular surfaces. the agglutinin was released from cotyledon surfaces into distilled water by a 1-minute immersion (or even less). homogenization of the washed cotyledons released residual agglutinating activity. the surface-located hemagglutinating activity was age-dependent ... | 1984 | 16663822 |
| temporal shifts in gene flow and seed set: evidence from an experimental population of cucumis sativus. | 1984 | 28563773 | |
| ethylene binding during leaf development and senescence and its inhibition by silver nitrate. | ethylene binding in situ was tested in leaves of tobacco (nicotiana tabacum l. var. xanthi) and of gynoecious and monoecious genotypes of cucumber (cucumis sativus l.) during their development and senescence. ethylene binding per gm fresh leaf remained constant during early stages of tobacco leaf development. it decreased in fully expanded leaves and during senescence of detached tobacco leaves. on a per leaf basis, ethylene binding increased as the leaf developed. the pattern for changes in eth ... | 1984 | 23195718 |
| photocontrol of hypocotyl elongation in light-grown cucumis sativus l. : a synergism between the blue-light photoreceptor and phytochrome. | an interaction is demonstrated between the effects of phytochrome and cryptochrome (the specific blue-light photoreceptor) in the inhibition of hypocotyl elongation of light-grown cucumber (cucumis sativus l.) cv. ridge greenline seedlings. at certain fluence rates of blue light the total inhibition response is greater than the sum of the separate responses to each photoreceptor. the threshold for response to blue light is reduced at least 30-fold by additional red-light irradiation. the synergi ... | 1984 | 24253223 |
| pectic polysaccharide breakdown of cell walls in cucumber roots grown with calcium starvation. | pectic polysaccharides from the roots of cucumber (cucumis sativus l.) grown in liquid culture medium with or without calcium (1 mm cacl(2)) were studied after extraction successively by hot water and na hexametaphosphate solution. the ca(2+) starvation-treatment caused a striking reduction in content of extracted pectic polysaccharide; from an equivalent weight of cell walls, only 33.1% of the control level was extracted from root cell walls of plants cultured under ca(2+) deficiency. the extra ... | 1984 | 16663897 |
| synthesis of a dicyclohexylcarbodiimide-binding proteolipid by cucumber (cucumis sativus l.) mitochondria. | when isolated cucumber (cucumis sativus l.) mitochondria were treated with (14)c-labelled dicyclohexylcarbodiimide (dccd), a single polypeptide was predominantly labelled. this polypeptide was soluble in 1-butanol or chloroform: methanol (2: 1, v/v) and had an apparent molecular mass of approximately 7 kda; it therefore had the characteristic properties of the dccd-binding proteolipid subunit of the atp synthase complexes of mitochondria, chloroplasts, and prokaryotes.when isolated cucumber mito ... | 1984 | 24177955 |
| hazardous marine animals. | both traumatic injury and the damage inflicted by envenomating marine animals are considered in this article. among the creatures causing traumatic injury are sharks, barracudas, moray eels, and needlefish. envenomating animals include sponges, coelenterates, coral, various mollusks, sea urchins, sea cucumbers, stingrays, sea snakes, and others. | 1984 | 6152553 |
| localization of mg-chelatase and mg-protoporphyrin ix monomethyl ester (oxidative) cyclase activities within isolated, developing cucumber chloroplasts. | magnesium chelatase and magnesium protoporphyrin ix monomethyl ester (oxidative) cyclase activities were both sensitive to inhibition by p-chloromercuribenzoate in intact, developing cucumber (cucumis sativus l. var beit alpha) chloroplasts. magnesium chelatase was also sensitive to the membrane-impermeable mercurial p-chloromercuribenzene sulfonate (pcmbs), while cyclase activity was only slightly sensitive. when the plastids were pretreated with pcmbs, triosephosphate dehydrogenase activity wa ... | 1984 | 16663683 |
| resolution and reconstitution of mg-protoporphyrin ix monomethyl ester (oxidative) cyclase, the enzyme system responsible for the formation of the chlorophyll isocyclic ring. | mg-protoporphyrin ix monomethyl ester (oxidative) cyclase, the system responsible for the formation of the chlorophyll isocyclic ring in developing cucumber (cucumis sativus l. cv beit alpha) chloroplasts, was resolved into two enzymic components: a high-speed supernatant and a membrane pellet. this reconstituted enzyme system required reduced pyridine nucleotide for activity. | 1984 | 16663682 |
| mefluidide protection of severely chilled crop plants. | mefluidide, the common name of n-(2,4-dimethyl-5-[([trifluoromethyl] sulfonyl)amino]phenyl)acetamide, is capable of protecting chilling sensitive plants such as cucumber (cucumis sativus l.) and corn (zea mays l.) from chilling injury. the applied concentrations that protect plants from stress are species specific. applied above a threshold concentration, it has no protective effect. regardless of its immediate potential for agriculture, it appears at least to be a powerful tool for the biologis ... | 1984 | 16663584 |
| physiology and bio - chemistry of germination of different types of seeds - iv - effect of certain chemicals on growth anddevelopment of cucumber, mungo, paddy, raddish and tomato plants. | the effect of 100 ppm solution of each of kinetin, adenine, uracil and thymine on the vegetative and reproductive growth of cucumis sativus, phaseolus mungo, oryza sativus, raphanus sativus and lycopersicum esculentum plants were studied. the rate of vegetative growth was found to be more in the cucumis sativus, raphanus sativus and lycopersicum esculentum plants treated with all the chemicals mentioned above over that of the controls. phaseolus mungo and oryza sativa plants shows almost the sam ... | 1984 | 22557413 |
| formation of mg-containing chlorophyll precursors from protoporphyrin ix, delta-aminolevulinic acid, and glutamate in isolated, photosynthetically competent, developing chloroplasts. | intact developing chloroplasts isolated from greening cucumber (cucumis sativus l. var beit alpha) cotyledons were found to contain all the enzymes necessary for the synthesis of chlorophyllide. glutamate was converted to mg-protoporphyrin ix (monomethyl ester) and protoclorophyllide. delta-aminolevulinic acid and protoporphyrin ix were converted to mg-protoporphyrin ix, mg-protoporphyrin ix monomethyl ester, protochlorophyllide and chlorophyllide a. the conversion of delta-aminolevulinic acid o ... | 1984 | 16663535 |
| photocontrol of hypocotyl elongation in de-etiolated cucumis sativus l. : long term, fluence rate-dependent responses to blue light. | hypocotyl growth in cucumis sativus l. cv ridge greenline is inhibited by increasing blue light (b) fluence rate in a near log linear fashion once a low fluence threshold is exceeded. deviation from log linearity at the highest fluence rate used here is due to light perceived by the cotyledons and this effect is assigned to phytochrome. this response can be removed by norflurazon treatment, without affecting the rest of the fluence response curve.there is also some activation of phytochrome by l ... | 1984 | 16663529 |
| competition for in vitro [h]gibberellin a(4) binding in cucumber by gibberellins and their derivatives. | the gibberellin (ga) binding properties of a cytosol fraction from hypocotyls of cucumber (cucumis sativus l. cv national pickling) were examined using a deae filter paper assay, [(3)h]ga(4), and over 20 gas, ga derivatives and other growth regulators. the results demonstrate structural specificity of the binding protein for gamma-lactonic c-19 gas with a 3 beta-hydroxyl and a c-6 carboxyl group. additional hydroxylations of the a, c, or d ring of the ent-gibberellane skeleton and methylation of ... | 1985 | 16664553 |
| chloroplast biogenesis 51 : modulation of monovinyl and divinyl protochlorophyllide biosynthesis by light and darkness in vitro. | it is shown that the monovinyl and divinyl protochlorophyllide biosynthetic patterns of etiolated maize (zea mays l.), and cucumber (cucumis sativus l.) seedlings and of their isolated etiochloroplasts can be modulated by light and darkness as was shown for green photoperiodically grown plants (e. e. carey, c. a. rebeiz 1985 plant physiol. 79: 1-6). in etiolated corn and cucumber seedlings and isolated etiochloroplasts poised in the divinyl protochlorophyllide biosynthetic mode by a 2 hour light ... | 1985 | 16664529 |
| photocontrol of hypocotyl elongation in light-grown cucumis sativus l. : responses to phytochrome photostationary state and fluence rate. | the effects of the calculated photostationary state of phytochrome (phi(c)) and the photon fluence rate on the elongation growth of the hypocotyl of light-grown seedlings of cucumis sativus l. are examined. two threshold responses to phi(c) are found at values of 0.06 and 0.43. at phi(c) = 0.06, there is no response at any fluence rate. in the phi(c) range 0.1 to 0.43, elongation growth does not respond to changes in phi(c). above the second threshold (phi(c) = 0.43), there is a strong response ... | 1985 | 16664520 |
| effects of acifluorfen on endogenous antioxidants and protective enzymes in cucumber (cucumis sativus l.) cotyledons. | the herbicide acifluorfen (2-chloro-4-(trifluoromethyl)phenoxy-2-nitrobenzoate) causes strong photooxidative destruction of pigments and lipids in sensitive plant species. antioxidants and oxygen radical scavengers slow the bleaching action of the herbicide. the effect of acifluorfen on glutathione and ascorbate levels in cucumber (cucumis sativus l.) cotyledon discs was investigated to assess the relationship between herbicide activity and endogenous antioxidants. acifluorfen decreased the leve ... | 1985 | 16664506 |
| in vitro culture of cucumis sativus l. v. stabilizing effect of glycine on leaf protoplasts. | a method for leaf mesophyll protoplast isolation and plant regeneration of cucumber (cucumis sativus l.) is described. using an isolation solution complemented with 0.1 m glycine, 8.2·10(6) viable protoplasts were isolated from 1 g of fresh leaves. the effect of the growth substances indole-3-acetic acid, naphthalene acetic acid, 2,4,-dichlorophenoxy acetic acid, 6-benzylaminopurine, 2-isopentenyladenine and kinetin at concentrations from 0.5 to 5 mg·1(-1) was studied using the multi-hanging dro ... | 1985 | 24253986 |
| diet and cancer of the stomach: a case-control study in greece. | a case-control study focusing on the role of diet in the etiology of gastric cancer was undertaken in piraeus, the sister city of athens, in a population characterized by ethnic homogeneity but substantial heterogeneity with respect to dietary habits. the case series consisted of 110 consecutive patients with histologically confirmed adenocarcinoma of the stomach, admitted to two teaching hospitals during a 3-year period; the control series consisted of orthopedic patients admitted to a nearby h ... | 1985 | 4030136 |
| a light-enhanced metabolism of sulfite in cells of cucumis sativus l. cotyledons. | the effects of light and several photosynthetic inhibitors on the rate of sulfite metabolism in cells obtained from cucumis sativus l. cotyledons was studied. the cells were treated with 200 μm na2so3 and the disappearance of sulfite was monitored using either dithiobisnitrobenzoic acid or fuchsin. the rate of sulfite disappearance in light was double the dark rate. disalicylidene propanediamine at 1 mm increased this light-enhanced metabolism approx. 50%; neither 1 μm 3,4-dichlorophenyl-n,n-dim ... | 1985 | 24241318 |
| isolation of serine:glyoxylate aminotransferase from cucumber cotyledons. | serine:glyoxylate aminotransferase, a marker enzyme for leaf peroxisomes, has been purified to homogeneity from cucumber cotyledons (cucumis sativus cv improved long green). the isolation procedure involved precipitation with polyethyleneimine, a two-step ammonium sulfate fractionation (35 to 45%), gel filtration on ultrogel aca 34, and ion exchange chromatography on diethylaminoethyl-cellulose, first in the presence of pyridoxal-5-phosphate, and then in its absence. the enzyme was purified appr ... | 1985 | 16664409 |
| effect of leaf detachment on chlorophyll fluorescence during chilling experiments. | the effect of leaf detachment on chlorophyll fluorescence was analyzed for zea mays, cucumis sativus, phaseolus vulgaris, and echinochloa crus-galli. results clearly indicate that detachment hastens the decrease in chlorophyll fluorescence during the course of chilling experiments. for maize and bean, the activity of photosystem ii of chloroplasts isolated from detached leaves is lower than that of chloroplasts isolated from attached leaves. there are also large differences in ionic loss between ... | 1985 | 16664345 |
| effects of various mixtures of ferulic acid and some of its microbial metabolic products on cucumber leaf expansion and dry matter in nutrient culture. | cucumber seedlings (cucumis sativus cv. 'early green cluster') ranging from 6 to 16 days of age were treated with various concentrations (0- 1 mm) of caffeic, ferulic,p-coumaric,p-hydroxybenzoic, protocatechuic, sinapic, syringic, and vanillic acids and mixtures of ferulic acid and one or two of the other phenolic acids. seedlings were grown in full-strength hoagland's solution which was changed every other day. phenolic acid treatments were given with each nutrient solution change starting at d ... | 1985 | 24310127 |
| photocontrol of hypocotyl elongation in light-grown cucumis sativus l. : the end-of-day response to phytochrome. | the control by phytochrome of hypocotyl elongation of light-grown cucumis sativus l. after a white-light period was examined. the farred-absorbing form of phytochrome inhibits hypocotyl elongation. the response to phytochrome photostationary state (ϕ) is not linear; all values of ϕ from 0.004 to 0.13 promote growth maximally, in the range of values of ϕ from 0.13 to 0.22 there is a linear growth response, between values of ϕ of 0.22 and 0.35 there is again no differential effect, and for ϕ value ... | 1985 | 24249570 |
| inhibition of chilling-induced photooxidative damage to leaves of cucumis sativus l. by treatment with amino alcohols. | the effect of pretreatment of cucumber (cucumis sativus l.) roots with choline chloride or ethanolamine on leaf phospholipid composition and light-induced leaf damage during chilling was studied. photooxidative chlorophyll degradation was similarly inhibited by both amino alcohols. the decrease of the chlorophyll a/chlorophyll b ratio and the increase of polyunsaturated-fatty-acid degradation during chilling in the light were equally inhibited by pretreatment with choline chloride or ethanolamin ... | 1985 | 24249503 |
| photosynthesis involvement in the mechanism of action of diphenyl ether herbicides. | photosynthesis is not required for the toxicity of diphenyl ether herbicides, nor are chloroplast thylakoids the primary site of diphenyl ether herbicide activity. isolated spinach (spinacia oleracea l.) chloroplast fragments produced malonyl dialdehyde, indicating lipid peroxidation, when paraquat (1,1'-dimethyl-4,4'-bipyridinium ion) or diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea] were added to the medium, but no malonyl dialdehyde was produced when chloroplast fragments were treated with ... | 1985 | 16664206 |
| fluorescence spectroscopy of iron-deficient plants. | iron deficient cucumber (cucumis sativus l.) plants and such differently supplied with iron were studied by low-temperature fluorescence emission and excitation spectroscopy. iron deficiency caused a relative decrease and a blue-shift of the 733 nm emission and a decrease or disappearance of the 700 and 707-710 nm excitation bands which are considered to belong to chlorophyll forms of psi. the process of iron uptake was observed after readdition of iron to previously iron-stressed plants. iron-d ... | 1985 | 23196178 |
| sequence analysis of vicia faba highly repeated dna: the bamhi repeated sequence families. | cleavage of vicia faba nuclear dna with the restriction endonuclease bamhi yielded discrete size classes of 250, 850, 900, 990, 1 150, 1 500 and 1 750 bp of highly repetitive dna. each of these sequence families comprised about 3% of the total genomic dna. some sequence members from each sequence family were cloned in pbr322 and their primary structures determined. computer analyses of nucleotide sequences suggested the existence of about 60 bp sequence periodicity within the repeating unit of t ... | 1985 | 24306539 |
| leaf carbohydrate status and enzymes of translocate synthesis in fruiting and vegetative plants of cucumis sativus l. | carbon partitioning in the leaves of cucumis sativus l., a stachyose translocating plant, was influenced by the presence or absence of a single growing fruit on the plant. fruit growth was very rapid with rates of fresh weight gain as high as 3.3 grams per hour. fruit growth was highly competitive with vegetative growth as indicated by lower fresh weights of leaf blades, petioles, stem internodes and root systems on plants bearing a single growing fruit compared to plants not bearing a fruit. ca ... | 1985 | 16663989 |
| kinetic separation of phototropism from blue-light inhibition of stem elongation. | these experiments tested the hypothesis that phototropic bending arises when a light gradient across the stem differentially inhibits cell elongation because of direct inhibition of cell elongation by light (the blaauw hypothesis). continuous irradiation of dark-grown cucumber seedlings (cucumis sativus l.) with unilateral blue light inhibited hypocotyl elongation within 30 s, but did not induce phototropic curvature until 4.5 h after the start of irradiation. marking experiments showed that cur ... | 1985 | 11538840 |
| [distribution of free carboxyl groups in native pectins from fruits and vegetables]. | pectins from 18 kinds of fruit and vegetable are extracted with ammonium oxalate from the alcohol-insoluble substance and fractioned on deae-sephacell. all the fruit pectins as well as tomato and sunflower pectin have in their distribution of the esterification degree a concentration maximum in the highly esterified range, that is above an esterification degree of 60%. with lower esterification degrees the concentration decreased continuously. vegetable pectins from cucumbers, celery, and tomato ... | 1985 | 4022106 |
| chloroplast biogenesis 49 : differences among angiosperms in the biosynthesis and accumulation of monovinyl and divinyl protochlorophyllide during photoperiodic greening. | various angiosperms differed in their monovinyl and divinyl protochlorophyllide biosynthetic capabilities during the dark and light phases of photoperiodic growth. some plant species such as cucumis sativus l., brassica juncea (l.) coss., brassica kaber (dc.) wheeler, and portulaca oleracea l. accumulated mainly divinyl protochlorophyllide at night. monocotyledonous species such as avena sativa l., hordeum vulgare l., triticum secale l., zea mays l., and some dicotyledonous species such as phase ... | 1985 | 16664351 |
| transformation of cucumber (cucumis sativus l.) plants with agrobacterium rhizogenes. | transgenic cucumber plants (cucumis sativus l., cv. 'straight eight') were regenerated from roots induced by inoculation of inverted hypocotyl sections with agrobacterium rhizogenes containing the vector parc8 in addition to the resident ri-plasmid. the dna transferred to the plant from the vector (t-dna) included a gene which encoded the enzyme neomycin phosphotransferase ii, and thus conferred on the plant cells resistance to kanamycin. the transgenic plants looked normal and were positive for ... | 1986 | 24240740 |
| evidence for a specific uptake system for iron phytosiderophores in roots of grasses. | roots of grasses in response to iron deficiency markedly increase the release of chelating substances (;phytosiderophores') which are highly effective in solubilization of sparingly soluble inorganic fe(iii) compounds by formation of fe(iii)phytosiderophores. in barley (hordeum vulgare l.), the rate of iron uptake from fe(iii)phytosiderophores is 100 to 1000 times faster than the rate from synthetic fe chelates (e.g. fe ethylenediaminetetraacetate) or microbial fe siderophores (e.g. ferrichrome) ... | 1986 | 16664577 |
| rna-directed rna polymerases from healthy and from virus-infected cucumber. | much work has been done on the isolation, purification, and characterization of the rna-directed rna polymerase (ec 2.7.7.48) of cucumber mosaic virus (cmv)-infected cucumbers. uninfected plants were reported to have no such enzyme, but we recently detected low levels of the activity in cucumber. since tobacco and cowpea contain such an enzyme that is variably increased in amount by various virus (as well as viroid) infections, we assumed that this would also be the case upon cmv infection of cu ... | 1986 | 3458203 |
| effects of wounding on cytokinin activity in cucumber cotyledons. | three known physiological responses to exogenous cytokinins were measured in wounded and nonwounded cotyledons from cucumber (cucumis sativus l. cv marketer) seedlings grown in darkness. enhanced cell division, chlorophyll formation, and cotyledon expansion were detected in wounded cotyledons. the data suggest that wounding enhances endogenous cytokinin activity. | 1986 | 16665151 |
| chloroplast biogenesis. demonstration of the monovinyl and divinyl monocarboxylic routes of chlorophyll biosynthesis in higher plants. | it is shown that barley (hordeum vulgare), a dark monovinyl/light divinyl plant species, and cucumber (cucumis sativus l.) a dark divinyl/light divinyl plant species synthesize monovinyl and divinyl protochlorophyllide in darkness from monovinyl and divinyl protoporphyrin ix via two distinct monovinyl and divinyl monocarboxylic chlorophyll biosynthetic routes. evidence for the operation of monovinyl monocarboxylic biosynthetic routes consisted (a) in demonstrating the conversion of delta-aminole ... | 1986 | 3759979 |
| regeneration of magnesium-2,4-divinylpheoporphyrin a(5) (divinyl protochlorophyllide) in isolated developing chloroplasts. | a preparation of developing chloroplasts isolated from greening cucumber (cucumis sativus l. var beit alpha) cotyledons was found capable of synthesizing divinyl protochlorophyllide (magnesium-2,4-divinylpheoporphyrin a(5)) in the presence of glutamate, adenosine triphosphate, reducing power, s-adenosyl-l-methionine, and molecular oxygen. both adenosine triphosphate and molecular oxygen were absolutely required while each of the other three was strongly promotive. organelle intactness was essent ... | 1986 | 16665008 |
| photosynthesis is not involved in the mechanism of action of acifluorfen in cucumber (cucumis sativus l.). | the possible role of photosynthesis in the mechanism of action of the herbicide acifluorfen (2-chloro-4-(trifluoromethyl)phenoxy-2-nitrobenzoate; af) was examined. the sensitivity to af of cotyledons of cucumber (cucumis sativus l.) which had been grown under far red light (fr) and white light were compared. fr grown tissues which were photosynthetically imcompetent were hypersensitive to af under white light and had approximately the same relative response to af under blue and red light as gree ... | 1986 | 16664919 |
| glyoxysomal malate synthase of cucumber: molecular cloning of a cdna and regulation of enzyme synthesis during germination. | a cdna clone for the glyoxysomal enzyme malate synthase was isolated from a cdna library made with polyadenylated rna from the cotyledons of germinating cucumis sativus l. this cloned dna sequence was used as a probe to characterize changes in the amounts of malate synthase gene transcripts in cotyledons of cucumber seeds grown both in the light and in the dark. malate synthase gene transcripts increase in amount to a peak at day 3 or day 4, and thereafter decline. in the light, this rate of dec ... | 1986 | 16664899 |
| partial purification and characterization of mrnas encoding glycollate oxidase and catalase. | polyadenylated mrna was prepared from etiolated and greening leaves of lens culinaris and cotyledons of cucumis sativus during the transition from etiolated to photoautotrophic stage. these mrna preparations were used to identify, by translation in vitro, the precursor forms of glycollate oxidase and catalase, both enzymes being markers of microbodies. the level (per fresh weight) of translatable rna coding for glycollate oxidase was found to increase ten fold during the first 3 d of illuminatio ... | 1986 | 24241847 |
| sterols of cucurbitaceae: the configurations at c-24 of 24-alkyl-δ(5)-,δ(7)- and δ(8)-sterols. | the major sterols of the seeds ofbenincasa cerifera, cucumis sativus, cucurbita maxima, c. pepo andtrichosanthes japonica and of the mature plant tissues (leaves and stems) ofcitrullus battich, cucumis sativus andgynostemma pentaphyllum of the family cucurbitaceae were 24-ethyl-δ(7)-sterols which were accompanied by small amounts of saturated and δ(5)-and δ(8)-sterols. the 24-ethyl-δ(7,22),δ(7,25(27)) and δ(7,22,25(27))-sterols constituted the predominant sterols for the seed materials, whereas ... | 1986 | 27519240 |
| acclimation to high co(2) in monoecious cucumbers : ii. carbon exchange rates, enzyme activities, and starch and nutrient concentrations. | carbon exchange capacity of cucumber (cucumis sativus l.) germinated and grown in controlled environment chambers at 1000 microliters per liter co(2) decreased from the vegetative growth stage to the fruiting stage, during which time capacity of plants grown at 350 microliters per liter increased. carbon exchange rates (cers) measured under growth conditions during the fruiting period were, in fact, lower in plants grown at 1000 microliters per liter co(2) than those grown at 350. progressive de ... | 1986 | 16664608 |
| acclimation to high co(2) in monoecious cucumbers : i. vegetative and reproductive growth. | co(2) concentrations of 1000 compared to 350 microliters per liter in controlled environment chambers did not increase total fruit weight or number in a monoecious cucumber (cucumis sativus l. cv chipper) nor did it increase biomass, leaf area, or relative growth rates beyond the first 16 days after seeding. average fruit weight was slightly, but not significantly greater in the 1000 microliters per liter co(2) treatment because fruit numbers were changed more than total weight. plants grown at ... | 1986 | 16664607 |
| induction of elf transmembrane potentials in relation to power-frequency electric field bioeffects in a plant root model system. ii. the effect of 60 hz electric fields on the growth of different regions of the cucurbit root elongation zone. | the region of elongation in cucumis sativus and cucurbita maxima roots was marked at increasing distances from the apex to provide an analog of increasing cell size. these roots were exposed/sham-exposed to 60 hz electric fields and the growth rates of the root segments measured. the growth rate effect magnitude varied with increasing distance from the root tip at constant field strength, and with increasing applied field strength. these results provide strong, qualitative support for the postul ... | 1986 | 3763828 |
| induction of elf transmembrane potentials in relation to power-frequency electric field bioeffects in a plant root model system. i. relationship between applied field strength and cucurbitaceous root growth rates. | seminal roots of cucumis sativus and cucurbita maxima were exposed to 60 hz electric fields of 100-500 v x m-1 in a conducting aqueous inorganic growth medium. root growth rates were measured to produce a dose-response relationship for each species. the species were selected for study because of their familial relationship, reported sensitivity to 60 hz, 360 v x m-1 electric fields, and differing average root cell sizes. the latter characteristic influences the magnitude of elf membrane potentia ... | 1986 | 3763827 |
| wavelength effect on the action of a n-phenylimide s-23142 and a diphenylether acifluorfen-ethyl in cotyledons of cucumber (cucumis sativus l.) seedlings. | specific wavelengths of light required for expression of phytotoxic activity of s-23142 (n-[4-chloro-2-fluoro-5-propargyloxy]phenyl-3,4,5,6-tetra- hydrophthalimide) and acifluorfen-ethyl (ethyl-5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitro benzoic acid) were determined in cotyledons of cucumber seedlings using the okazaki large spectrograph. leakage of amino acids from the cotyledons was measured as an indication of the phytotoxic activity. the wavelength effects showed common major peaks of a ... | 1987 | 16665819 |
| characterization of repetitive elements in several cucurbita species. | about 1.3×10(5) copies of a tandemly arranged, 351 base pair element constitute from 4 to 8% of the cucurbita pepo genome. a homologous, high copy number repetitive element is present in the genomes of c. moschata and c. foetidissima, but not in c. maxima or cucumis sativus. array lengths of at least 65 members have been detected for c. pepo, and 140 for c. moschata. the nucleotide sequence of six c. pepo repeat units were determined and each was found to be unique, differing from the others at ... | 1987 | 24301312 |
| viroids: molecular infectious agents. | in 1971, unique small rna molecules, the viroids, were found to cause specific infectious diseases of plants. they are the smallest and simplest contagious agents known. until now, 14 viroids have been described and 12 diseases of potatoes, tomatoes, citruses, chrysanthemums, cucumbers, hops, coconut palms avocado trees and burdock are known to be caused by viroids. the common symptoms of these diseases are: stunting of plants. discoloration of veins, epinasty, curling and distortions of leaves, ... | 1987 | 2449812 |
| regulation of photosynthetic carbon metabolism in cucumber by light intensity and photosynthetic period. | the effects of photosynthetic periods and light intensity on cucumber (cucumis sativus l.) carbon exchange rates and photoassimilate partitioning were determined in relation to the activities of galactinol synthase and sucrose-phosphate synthase. carbon assimilation and partitioning appeared to be controlled by different mechanisms. carbon exchange rates were influenced by total photon flux density, but were nearly constant over the entire photoperiod for given photoperiod lengths. length of the ... | 1987 | 16665742 |
| bladder perforation caused by cucumis sativus repaired per vagina. | a case of bladder perforation secondary to simulated intercourse with a cucumber is presented. treatment by primary vaginal repair was successful. | 1987 | 3629770 |
| highly acidic glycans from sea cucumbers. isolation and fractionation of fucose-rich sulfated polysaccharides from the body wall of ludwigothurea grisea. | the body wall of the sea cucumber contains high amounts of sulfated glycans, which differ in structure from glycosaminoglycans of animal tissues and also from the fucose-rich sulfated polysaccharides isolated from marine algae and from the jelly coat of sea urchin eggs. in ludwigothurea grisea, glycans can be separated into three fractions which differ in molecular mass and chemical composition. the fraction containing a high-molecular-mass component has a high proportion of fucose and small amo ... | 1987 | 3038547 |
| inheritance of seed weight in cucumis sativus (l.) var. sativus and var. hardwickii (royle) kitamura. | a series of experiments was conducted to determine the inheritance of seed weight in cucumber. matings between a cucumis sativus var. sativus (cs) l. inbred line (usda wi 1606; p1) and a c. sativus var. hardwickii (royle) kitamura (ch) collection (pi 215589; p2) were made to produce seed of reciprocal f1, f2, and bc1 families. families were grown under field and greenhouse conditions, and seeds were extracted from fruit 55 to 60 days post-pollination. seed of f1 and f2 families was obtained usin ... | 1987 | 24241811 |
| comparison of tissue preparation methods for assay of nicotinamide coenzymes. | to prepare tissues for analysis of nad(+), nadh, nadp(+), and nadph, common practice is to freeze samples in liquid nitrogen, often followed by freeze-drying, before extraction in hcl or naoh. with cucumber (cucumis sativus l.) cotyledons, prefreezing in liquid nitrogen or slower freezing to -20 degrees c yielded substantially lower values for nadh and nadph than obtained from samples homogenized immediately in acid or base. freeze-drying after freezing in liquid nitrogen generally caused even l ... | 1987 | 16665633 |
| influence of chloroplast development on the activation of the diphenyl ether herbicide acifluorfen-methyl. | the activity of acifluorfen-methyl (afm); methyl 5-(2-chloro-4-[trifluoromethyl] phenoxy)-2-nitrobenzoate in excised cucumber cotyledons (cucumis sativus l.) was examined. afm induced membrane disruption, was significantly greater when etiolated cotyledons were illuminated 16 hours at 150 microeinsteins per square meter per second photosynthetically active radiation versus incubation under illumination of 4-fold greater intensity. these results were unexpected since the loss of membrane integrit ... | 1987 | 16665570 |
| chilling sensitivity of cucumber cotyledon protoplasts and seedlings. | cucumber (cucumis sativus l.) seedlings are more sensitive to chilling stress when transferred to low temperature from the night cycle than from the day cycle. however, greater damage occurs when chilling is carried out in light than in dark. freshly isolated protoplasts are extremely sensitive to damage when chilled at 4 degrees c in light, but suffer significantly less injury when chilled in dark. if freshly isolated protoplasts are pre-chill conditioned at 27 degrees c in either light or dark ... | 1987 | 16665501 |
| wall relaxation in growing stems: comparison of four species and assessment of measurement techniques. | this study was carried out to develop improved methods for measuring in-vivo stress relaxation of growing tissues and to compare relaxation in the stems of four different species. when water uptake by growing tissue is prevented, in-vivo stress relaxation occurs because continued wall loosening reduces wall stress and cell turgor pressure. with this procedure one may measure the yield threshold for growth (y), the turgor pressure in excess of the yield threshold (p-y), and the physiological wall ... | 1987 | 24227336 |
| the toxicologic effects of the carbamate insecticide aldicarb in mammals: a review. | aldicarb, 2-methyl-2-(methylthio)propionaldehyde-o-methylcarbamoyloxime, is an oxime carbamate insecticide manufactured by the union carbide corporation and sold under the trade name temik. it is a soil-applied systemic pesticide used against certain insects, mites, and nematodes, and is applied below the soil surface for absorption by plant roots. it is generally applied to the soil in the form of 5, 10, or 15% granules, and soil moisture is essential for the release of the toxicant. uptake by ... | 1987 | 3304999 |
| chilling-enhanced photooxidation : evidence for the role of singlet oxygen and superoxide in the breakdown of pigments and endogenous antioxidants. | chilling temperatures (5 degrees c) and high irradiance (1000 microeinsteins per square meter per second) were used to induce photooxidation in detached leaves of cucumber (cucumis sativus l.), a chilling-sensitive plant. chlorophyll a, chlorophyll b, beta carotene, and three xanthophylls were degraded in a light-dependent fashion at essentially the same rate. lipid peroxidation (measured as ethane evolution) showed an o(2) dependency. the levels of three endogenous antioxidants, ascorbate, redu ... | 1987 | 16665236 |
| chilling-enhanced photooxidation : the peroxidative destruction of lipids during chilling injury to photosynthesis and ultrastructure. | chilling-induced photooxidation was studied in detached leaves of chilling-sensitive (cs) cucumber (cucumis sativus l.) and chilling resistant (cr) pea (pisum sativum l.). the rates of photosynthesis and respiration, measured as o(2) exchange, were found to be comparable in the two species over a temperature range of 5 to 35 degrees c. chilling at 5 degrees c for 12 hours in high light (1000 microeinsteins per square meter per second) decreased co(2) uptake 75% in detached pea leaves whereas co( ... | 1987 | 16665235 |
| wall relaxation in growing stems: comparison of four species and assessment of measurement techniques. | this study was carried out to develop improved methods for measuring in-vivo stress relaxation of growing tissues and to compare relaxation in the stems of four different species. when water uptake by growing tissue is prevented, in-vivo stress relaxation occurs because continued wall loosening reduces wall stress and cell turgor pressure. with this procedure one may measure the yield threshold for growth (y), the turgor pressure in excess of the yield threshold (p-y), and the physiological wall ... | 1987 | 11539726 |
| effects of 60-hz electric fields on cellular elongation and radial expansion growth in cucurbit roots. | serial longitudinal and transverse sections were prepared from roots of cucumis sativus and cucurbita maxima that had been exposed/sham-exposed to 60-hz electric fields for 0-2 days. field exposures were selected to produce a 10-20% or a 70-80% growth inhibition in whole roots of both species. cortical cell length and diameter were measured using a microscope and eyepiece micrometer; measurements were conducted "blind." in both species, inhibition of cellular elongation was associated with expos ... | 1987 | 3580000 |
| do some plant responses to cytokinins involve the cyanide-resistant respiratory pathway? | a disengagement of the cyanide-resistant, alternative respiratory pathway in soybean (glycine max (l.) merr.) callus tissue was observed prior to the start of deoxyisoflavone production stimulated by addition of the cytokinin benzyladenine. to test whether this loss of alternativepathway activity was part of the response to cytokinin, inhibitors of the alternative pathway were assayed for their ability to elicit cytokinin-like responses. salicylhydroxamic acid (sham) was found to produce a deoxy ... | 1987 | 24225916 |
| effect of altered sink: source ratio on photosynthetic metabolism of source leaves. | when seven crop species were grown under identical environmental conditions, decreased sink:source ratio led to a decreased photosynthetic rate within 1 to 3 days in cucumis sativus l., gossypium hirsutum l., and raphanus sativus l., but not in capsicum annuum l., solanum melongena l., phaseolus vulgaris l., or ricinus communis l. the decrease was not associated with stomatal closure. in cotton and cucumber, sink removal led to an increase in starch and sugar content, in glucose 6-phosphate and ... | 1987 | 16665777 |
| phytochrome photoconversion in vivo: comparison between measured and predicted rates. | the measured rates of phytochrome photoconversion in vivo, in etiolated cabbage (brassica oleracea l.) seedlings and cucumber (cucumis sativus l.) cotyledons, under blue, red, and far red irradiation, are significantly different from those predicted on the basis of the spectral photon flux distributions of the light sources and optical parameters of purified phytochrome. the geometrical relationships between the light source and the irradiated sample affect the rate of phytochrome photoconversio ... | 1988 | 16665981 |
| identification of a dispersed mboi repeat family in five higher plant genomes. | digestion of nuclear dnas of five plants, namely cucurbita maxima (red gourd), trichosanthes anguina (snake gourd), cucumis sativus (cucumber), cajanus cajan (pigeon pea) and phaseolus vulgaris (french bean) with the restriction endonuclease mboi yielded discrete size classes with molecular weights in the range of 0.5 to 5 kbp. the mboi digestion pattern of cot 0.1 dna in french bean is comparable with that of total dna, indicating that these bands represented highly repeated dna sequences. clea ... | 1988 | 3233342 |
| radiation preservation of foods of plant origin. part vi. mushrooms, tomatoes, minor fruits and vegetables, dried fruits, and nuts. | in this concluding article in the series on the technological feasibility of ionizing radiation treatment for shelf life improvement of fruits and vegetables, the present status of research on several commodities that have not been dealt with earlier is discussed. the commodities include mushrooms, tomatoes, pineapples, lychees, longans, rambutans, mangostenes, guavas, sapotas, loquats, ber, soursops, passion fruits, persimmons, figs, melons, cucumbers, aubergines, globe artichokes, endives, let ... | 1988 | 3280249 |
| 4-amino-5-hexynoic acid-a potent inhibitor of tetrapyrrole biosynthesis in plants. | 4-amino-5-hexynoic acid, a suicide inactivator of the mammalian pyridoxal phosphate-dependent 4-aminobutyric acid:2-oxoglutaric acid aminotransferase, inhibits phytochrome and chlorophyll synthesis in developing oat (avena sativa l.), corn (zea mays l.), pea (pisum sativum l.), and cucumber (cucumis sativus l.) seedlings. in avena and cucumis seedlings, respectively, inhibition of phytochrome and chlorophyll accumulation by 4-amino-5-hexynoic acid can be significantly reversed by application of ... | 1988 | 16666377 |
| sun-beams, cucumbers, and purple bacteria : historical milestones in early studies of photosynthesis revisited. | discovery of the general outlines of plant and bacterial photosyntheses required the efforts of a large number of gifted scientists over the course of two centuries. the first to suggest that sunlight might affect plants in some way other than through conversion of light to heat was stephen hales, in 1725, and this notion was promptly satirized by jonathan swift in his description of the "cucumber project" ingulliver's travels (1726). considerably later, in 1772, joseph priestley reported the fi ... | 1988 | 24425441 |
| phase determination by multiple-wavelength x-ray diffraction: crystal structure of a basic "blue" copper protein from cucumbers. | a novel x-ray diffraction technique, multiple-wavelength anomalous dispersion (mad) phasing, has been applied to the de novo determination of an unknown protein structure, that of the "blue" copper protein isolated from cucumber seedlings. this method makes use of crystallographic phases determined from measurements made at several wavelengths and has recently been made technically feasible through the use of intense, polychromatic synchrotron radiation together with accurate data collection fro ... | 1988 | 3406739 |
| transmission of tomato ringspot virus by xiphinema americanum and x. rivesi from new york apple orchards. | populations of xiphinema americanum and x. rivesi were collected from apple orchards in eastern and western new york and tested in the laboratory for ability to transmit tomato ringspot virus (tmrsv) to cucumber and dandelion. populations varied in the frequency with which they transmitted tmrsv, but this variation did not correspond to variation in disease prevalence in the orchard. the lower prevalence of tmrsv-incited disease in apple trees in western new york cannot be attributed to inabilit ... | 1988 | 19290213 |
| mechanism of rapid suppression of cell expansion in cucumber hypocotyls after blue-light irradiation. | rapid suppression of hypocotyl elongation by blue light in cucumber (cucumis sativus l.) was studied to examine possible hydraulic and wall changes responsible for diminished growth. cell-sap osmotic pressure, measured by vaporpressure osmometry, was not decreased by blue light; turgor pressure, measured by the pressureprobe technique, remained constant during the growth inhibition; and stem hydraulic conductance, measured by dynamic and static methods, was likewise unaffected by blue light. wal ... | 1988 | 24220741 |
| effect of three plant species on population densities of xiphinema americanum and x. rivesi. | a taxonomic revision of the xiphinema americanum species complex has necessitated a reexamination of the host range of species in the complex before recommendations can be made with confidence on the likelihood that specific crops will be damaged. toward this end, populations of x. americanum and x. rivesi collected from apple orchards in eastern and western new york state were evaluated after 3 months in pots planted with cucumber, apple, or dandelion seedlings. eastern and western new york pop ... | 1988 | 19290240 |
| accumulation of photodynamic tetrapyrroles induced by acifluorfen-methyl. | treatment with acifluorfen-methyl (afm), methyl 5-(2-chloro-4-[tri-fluoromethyl] phenoxy)-2-nitrobenzoate, inhibited protochlorophyllide synthesis in dark-held, delta-amino levulinic acid-fed, excised cotyledons of cucumber (cucumis sativus l.). protochlorophyllide and protoporphyrin ix levels in afm-treated cotyledons were inversely related and dependent on afm concentration; as the herbicide dose increased, protoporphyrin ix levels also increased with a concomitant loss of protochlorophyllide. ... | 1988 | 16666198 |
| induction of 33-kd and 60-kd peroxidases during ethylene-induced senescence of cucumber cotyledons. | ethylene enhanced the senescence of cucumber (cucumis sativus l. cv ;poinsett 76') cotyledons. the effect of 10 microliters per liter ethylene was inhibited by 1 millimolar silver thiosulfate, an inhibitor of ethylene action. an increase in proteins with molecular weights of 33 to 30 kilodaltons and lower molecular weights (25, 23, 20, 16, 12, and 10 kilodaltons) were observed in sodium dodecyl sulfate-polyacrylamide gel electrophoresis gels after ethylene enhanced senescence. the measurement of ... | 1988 | 16666194 |
| somatic embryogenesis and plant regeneration from cell suspension cultures of cucumis sativus l. | a procedure for the regeneration of whole cucumber plants (cucumis sativus l. cv. poinsett 76) by embryogenesis from cell suspension cultures is described. embryogenic callus was initiated from the primary leaves of 14-17 day old plants. suspension cultures of embryogenic cells were grown in liquid murashige and skoog basal medium containing 5 um 2,4,5-trichlorophenoxyacetic acid and 4 um 6-benzylaminopurine. suspension cultures were composed of a population of cells that were densely cytoplasmi ... | 1988 | 24241765 |
| effect of restricted root growth on carbohydrate metabolism and whole plant growth of cucumis sativus l. | the effects of varied rooting volumes on root growth and source leaf carbohydrate metabolism were studied in greenhouse-grown cucumber (cucumis sativus l cv calypso) plants. plants were grown for 7 weeks in container volumes that ranged from 0.4 to 5.9 liters. plants grown in the smaller containers exhibited less leaf expansion, lower root and shoot weight, and fewer lateral stems than plants grown in the 5.9 liter containers. shoot/root ratio was not altered by the container volume, suggesting ... | 1988 | 16666155 |
| complex structure of the ribosomal dna spacer of cucumis sativus (cucumber). | the nuclear 18 s, 5.8 s and 25 s ribosomal rna genes (rdna) of cucumis sativus (cucumber) occur in at least four different repeat types of 10.2, 10.5, 11.5, and 12.5 kb in length. the intergenic spacer of these repeats has been cloned and characterized with respect to sequence organization. the spacer structure is very unusual compared to those of other eukaryotes. duplicated regions of 197 bp and 311 bp containing part of the 3'end of the 25 s rrna coding region and approximately 470 bp of 25 s ... | 1988 | 3419423 |
| chloroplast biogenesis 60 : conversion of divinyl protochlorophyllide to monovinyl protochlorophyllide in green(ing) barley, a dark monovinyl/light divinyl plant species. | in higher plants, most of the chlorophyll a is formed via the divinyl and monovinyl chlorophyll monocarboxylic biosynthetic routes. these two routes are strongly interconnected prior to protochlorophyllide formation in barley (hordeum vulgare l. cv morex), a dark monovinyl-light divinyl plant species, but not in cucumber (cucumis sativus l. cv beit alpha mr), a dark divinyl-light divinyl plant species (bc tripathy, ca rebeiz, 1986 j biol chem 261: 13556-13564). it is shown that in dark monovinyl ... | 1988 | 16666133 |